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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Research Journal of Pharmacognosy
- نوع مقاله: Journal Article
- کلمات کلیدی: essential oil,Genetic distance,RAPD markers,DNA amplification,Ephedra
- چکیده:
- چکیده انگلیسی: Background and objectives: The genus Ephedra (Ephedraceae) consists of about 40 species of mostly shrubs and rarely small trees around the world. In the present study, the essential oil (EO) diversity and genetic relationships were investigated in six Ephedra species from Iran using Random Amplified Polymorphic DNA (RAPD) markers. Methods: Theplants were collected from two different provinces; Azarbayjan (north-west) and Khorasan (north-east) of Iran. The EOs were obtained by hydro-distillation and analyzed by GC and GC/MS. The DNA was extracted from the aerial parts of the plants using a Qiagen Dneasy Plant Mini Kit. Amplification was performed using decamer RAPD primers. Results: A total of 187 bands were scored and used for the analysis of genetic distances. Genetic distance values ranged from 0.25 to 0.95.The analysis showed the highest genetic diversity (25%) between E. foliata with other species. Ephedra foliata formed a distinct group. Ephedra strobilacea was found to be the most similar to E. sarcocarpa (male).Conclusion: High genetic and EO diversity was demonstrated in this genus which should be further studied in order to make more efficient use of the species and considering relevant conservation programs.
- انتشار مقاله: 31-01-1396
- نویسندگان: M. Ehtesham-Gharaee,B.A. Hoseini,M. Hassanzadeh Khayyat,S.A. Emami,J. Asili,A. Shakeri,M. Hassani,A. Ansari,S. Arabzadeh,J. Kasaian,J. Behravan
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Stress Analysis
- نوع مقاله: Journal Article
- کلمات کلیدی: finite element method,Residual Stresses,Roughness,Shot Peening,Response Surface Methodology(RSM)
- چکیده:
- چکیده انگلیسی: This paper aimed to study the process of shot peening using the combination of the Finite Element Analysis (FEA) and the Response Surface Methodology (RSM). The shot velocity, shot diameter, coverage percentage and thickness are selected as process parameters. Residual compressive stresses and roughness are considered as response variables. Using FEA, shot peening is simulated and RSM is employed to determine the governing models between the response variables and the input parameters. The statistical analysis of the results reveals that: (1) the induced surface stress depends upon the coverage percentage and sample thickness, and it is independent of the shot velocity and shot diameter, (2) the maximum compression stress depends on the coverage percentage and shot diameter respectively, (3) the depth of maximum compressive stress depends on shot velocity and shot diameter respectively, (4) the depth of compressive stress is dependent on all four factors, (5) the roughness, Ra, is only dependent on the shot velocity. The results are in good agreement with the experimental data of the literature.
- انتشار مقاله: 03-07-1399
- نویسندگان: M. Hassanzadeh,S.E. Moussavi Torshizi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Stress Analysis
- نوع مقاله: Journal Article
- کلمات کلیدی: Finite element,Sensitivity analysis,Hybrid method,Direct sensitivity method,Complex variables
- چکیده:
- چکیده انگلیسی: In this study, a novel hybrid method was presented by considering the strengths and weaknesses of the two methods of the direct sensitivity method (DSM) and the complex variables method (CVM) and combining them to calculate shape sensitivity. The most of methods available are highly dependent on the values of step size variation related to the type of the problem. To validate the proposed method, some examples were analyzed by using the written finite element code. The comparison of results at solved problems indicated the independency of the proposed method from step size and only need to select an arbitrary small step size and the rounding error is negligible. It is a sign of its high computational performance which converges to reliable, stable, and high-precision results and saves calculation time compared to the other methods. The other advantages of the proposed method are the low volume of occupied memory and simplicity of implementation and its application in a wide range of engineering problems having simple and complicated equations.
- انتشار مقاله: 25-01-1399
- نویسندگان: M. Sheikhi Azqandi,M. Hassanzadeh,M. Arjmand
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Veterinary Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Broiler chicken,Thyroid Hormones,Ascites,Blood gases
- چکیده:
هدف این مطالعه یافتن رابطه میان گازهای خون و هورمونهای تیروئیدی با سندرم آسیت در جوجههای گوشتی پرورش یافته در شرایط دمای محیطی پایین و تغذیه با خوراک متراکم بود. 160 قطعه جوجه گوشتی یک روزه به طور تصادفی به دو گروه مساوی تقسیم شدند. جوجههای گروه 1 با خوراک متراکم در شرایط دمای محیطی پایین پرورش داده شدند تا رخداد آسیت در آنها افزایش یابد. سطح گازهای خون، هورمونهای تیروئیدی و بازدهی رشد به طور هفتگی در جوجههای هر دو گروه ثبت شد. برای تعیین مقدار شاخص فشار شریانی، قلب پرندگان تلف شده و کشتار شده بازرسی شد. رخداد آسیت در جوجههای گروه 1 که در دمای محیطی پایین پرورش یافته بودند به روشنی بیشتر از جوجههای گروه 2 (شرایط معمولی) بود. میانگین فشار گاز کربنیک در جوجههای گروه 1 به طور معنیداری بیشتر از جوجههای گروه 2 بود. در حالی که فشار اکسیژن خون در دو گروه یاد شده بر عکس بود. مقادیر هورمونهای تیروئیدی مانند گازهای خون در سن 4 هفتگی تغییر کرد. به طور خلاصه، این مطالعه نشان داد که رابطه معنیداری میان فعالیت هورمونهای تیروئیدی، سطح گاز کربنیک و اکسیژن خون وریدی در دو گروه آزمایش مورد مطالعه وجود دارد.
- چکیده انگلیسی:
The objective of this study was to find a relationship between blood gas parameters and thyroid hormone
activity with ascites syndrome in broiler chickens exposed to cold temperature and receiving a high quality
diet. One hundred and sixty one-day-old broiler chicks were randomly divided in two equal groups. To
increase the incidence of ascites, chicks of group 1 were fed ad libitum with a higher condensed diet and
reared under a lower ambient temperature. Weekly, blood gas parameters and thyroid hormone levels were
measured and growth performance was recorded. The hearts of dead and slaughtered birds were examined for determination of arterial pressure index (API) values. Ascites incidence was clearly higher in cold-exposing chickens compared with normal rearing chickens. The mean values of carbon dioxide tension of group 1 chickens were significantly higher compared with group 2 chickens at the 4th and 5th weeks of age, while the phenomenon of oxygen was reversed in these two experimental groups. The function of thyroid hormone levels were changed at week 4 of age, as observed for blood gas parameters. In conclusion, the present study showed a significant association between thyroid hormones functions, the levels of venous blood carbon dioxide and oxygen pressures in the two groups of chickens.- انتشار مقاله: 25-01-1389
- نویسندگان: H. Moayyedian,K. Asasi,S. Nazifi,M. Hassanzadeh,M. Ansari-Lari
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Veterinary Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Anatomy,Broiler Chickens,Ascites,pCO2,Cardiopulmonary system
- چکیده: جهت بررسی رابطه بین پارامترهای آناتومی قلب و سیستم تنفس و میزان گازهای تنفسی خون با وقوع سندرم آسیت در دو نژاد مختلف از جوجههای گوشتی که دارای سرعت رشد و حساسیت متفاوتی نسبت به وقوع آسیت بودند، 340 قطعه جوجه از هر یک از دو نژاد تهیه گردید. در طول دوره پرورش نسبت وزن و حجم قلب، نسبت وزن و حجم ریه و نیز حجم قفسه سینه پرنده قبل و بعد از خروج قلب و ریه، میزان گازهای تنفسی pCO2 و pO2 خون سیاهرگی، پارامترهای رشد و میزان وقوع آسیت آنها مورد بررسی قرار گرفت. در این مطالعه حجم ریه و حجم قفسه سینه جوجههای گوشتی که از سرعت رشد بیشتری برخوردار بودند و در نتیجه به سندرم آسیت بیشتری مبتلا شدند، به شکل معنیداری بالاتر از جوجههایی که از سرعت رشد کمتری برخوردار بودند مشاهده گردید. در حالی که جوجههای با رشد سریع نسبت به جوجههای با رشد کند، همزمان فشار گاز تنفسی pCO2 بیشتر و pO2 کمتری در خون سیاهرگی خود نشان دادند. نتایج این تحقیق نشان داد که یک رابطهای بین ناکافی بودن رشد و تکامل پارامترهای سیتم قلبی-ریوی و میزان گازهای تنفسی جوجههای گوشتی که مستعد ابتلا به سندرم آسیت هستند، وجود دارد.
- چکیده انگلیسی: The present study was designed to examine the anatomical parameters of the cardiopulmonary system,
the function of venous blood gas parameters and the development of ascites incidence in two genetic line
chickens. Three hundred forty day-old chickens from two pure broiler breeder lines, which were different in
their growth rate and susceptibility to ascites syndrome were obtained. The relative heart and lung weights,
the volumes of the heart, lung and thorax cavity, the incidence of ascites, and the venous blood gas
parameters in these two genetic line chickens were followed. In the present study, the incidence of ascites
and right ventricular hypertrophy was markedly higher in the fast-growing broiler chickens compared to the
slow-growing chickens, as two genetic line chickens exhibited significant differences in their growth
performance traits. The volumes of the thorax cavity, before and after removing the heart and lung tissues,
were lower in fast-growing broiler chickens compared to the slow-growing chickens. The relative lung
volume was significantly lower in the fast growth chickens than the slow growth chickens at the earlier age,
but it did not differ at the later age. Additionally, a rise in carbon dioxide tension and a decline in oxygen
pressure in the venous blood of rapid growth compared tothe slow growth broiler chickens were observed. It
could be concluded that there is an association between the insufficiencies of the cardiopulmonary system
with the function of the venous blood gas parameters and the development of ascites syndrome in fast
growing broiler chickens.- انتشار مقاله: 17-09-1388
- نویسندگان: F. Al-Masri,M. Hassanzadeh
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Medical Sciences
- نوع مقاله: Journal Article
- کلمات کلیدی:
- چکیده:
- چکیده انگلیسی: Background: Turner syndrome (TS) is a sporadic disorder caused by the absence of all or some parts one X-chromosome with major developmental consequences such as short stature and ovarian failure etc. The minor manifestations of TS are cubitus valgus, micrognatism, high-arched palate, short and/or webbed neck, hypothyroidism, etc. Different karyotype abnormalities may lead to different clinical features; therefore, in this study we have tried to postulate karyotype-phenotype correlations in these patients. Methods: In order to assess karyotype-phenotype correlations, 209 proven TS patients were studied and chromosomal analysis was performed on the basis of G-banding technique at high resolution. Results: According to cytogenetic findings, karyotype abnormalities were classified into four groups: classic form 19%; mosaic form 76%; long arm isochromosome 4% and short arm deletion 1%. Clinical manifestations were more severe in classic TS rather than the other forms of chromosomal abnormalities. Conclusion: The results of this study suggest that karyotype variations might affect phenotype of Turner syndrome. Therefore, chromosomal investigation for all suspected cases of Turner syndrome should be considered in order to approach an appropriate treatment protocol.
- انتشار مقاله: 06-07-1394
- نویسندگان: M. Hassanzadeh Nazarabadi,S.A. Seyyedi,R. Aboutorabi
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of Nanoscience and Nanotechnology
- نوع مقاله: Journal Article
- کلمات کلیدی: Adsorption,Arsenic(III) removal,Cerium(IV) oxide,Iron(III) oxide,Nanocomposite.
- چکیده:
- چکیده انگلیسی: In the present study, CeO2/Fe2O3 nanocomposite was prepared by co-precipitation method and its application was investigated for arsenic removal from water. Characterization of the nano sized adsorbent particles was carried out using SEM and XRD techniques. Systemic adsorption experiments were performed in batch systems and the optimum conditions were obtained. The effects of pH, contact time, adsorbent mass, temperature, ionic strength and initial concentration of arsenic were investigated on kinetics and equilibrium of the adsorption. Thermodynamic parameters and adsorption kinetics were studied in detailed to know the nature and mechanism of adsorption. Kinetic studies showed that the adsorption process followed pseudo second order kinetic model. The thermodynamic parameters such as ΔG⁰, ΔS⁰ and ΔH⁰ were calculated, and it was found that the reaction was spontaneous and exothermic in nature. Adsorption equilibrium was studied using Langmuir and Freundlich isotherm models. It was observed that the investigated adsorption process followed Freundlich isotherm. Adsorption capacity (q0) calculated from Langmuir isotherm was found to be 8.260 mg.g-1.The results showed that CeO2/Fe2O3 nanocomposite particles can be effectively used for the removal of As(III) ions from aqueous solutions.
- انتشار مقاله: 17-02-1394
- نویسندگان: R. Ansari,M. Hassanzadeh,F. Ostovar
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of Engineering, Transactions A: Basics
- نوع مقاله: Journal Article
- کلمات کلیدی: finite element method,Analytical method,Brushless Permanent Magnet Motor
- چکیده:
- چکیده انگلیسی: Both the cogging and electromagnetic torques depends on the shape of the flux density distribution in the airgap region. A two-dimensional (2-D) analytical method for predicting the open- circuit airgap field distribution in brushless permanent magnet motors, considering the direction of magnetization, i.e., radial or parallel, and the effect of real shape of stator slot-openings is presented in this paper. It involves the solution of the governing field equations in polar coordinates in airgap and magnet regions. This method uses a new 2-D relative permeance function. For the comparison purposes, a 2-D finite element (FE) analysis is used for the analysis of a fully-pitched, double-layer windings brushless permanent-magnet (PM) drive. The results obtained by this method are very close to those obtained by FE analysis especially at the corner tips of the tooth.
- انتشار مقاله: 11-10-1348
- نویسندگان: M. R. Hassanzadeh,A. Kiyoumarsi,M. Moallem
- مشاهده
- جایگاه : پژوهشی
- مجله: Caspian Journal of Environmental Sciences
- نوع مقاله: Journal Article
- کلمات کلیدی: Hematology,biochemistry,Acipenser persicus,Starvation,Physiology,Compensatory growth
- چکیده:
- چکیده انگلیسی: The effect of starvation and re-feeding was investigated on growth, hematology and biochemical parameters in juvenile Persian sturgeon (Acipenser persicus). Three hundred and seventyfive fish (108±0.63 g) were divided into five feeding groups. The control group (C) was fed to satiation three times a day during the experiment. The four groups were starved for 1 (W1), 2 (W2), 3 (W3), and 4 (W4) weeks respectively, and then fed to satiation during a 4 week re-feeding period.The results indicated that some parameters including final weight, specific growth rate, body weight increase, plasma enzymes (ALT, Alanine aminotransferase, AST, Aspartat aminotransferase and ALP, Alkaline phosphatase(, hematological parameters [Mean corpuscular volume (MCV), mean corpuscular hemoglobin concentration (MCHC), and mean corpuscular hemoglobin (MCH)]were significantly affected by feeding regimes. The plasma cortisol, hematocrit, lymphocytes, neutrophils, eosinophils, and monocytes were not affected by starvation and subsequent re-feeding. These findings showed that short term starvations had no significant negative effects on growth performance, most biochemical and hematological parameters in Persian sturgeon couldrecover when re-feeding resumed.
- انتشار مقاله: 14-07-1393
- نویسندگان: M. Yarmohammadi,M. Pourkazemi,R. Kazemi,M. Pourdehghani,M. Hassanzadeh Saber,L. Azizzadeh
- مشاهده
- جایگاه : پژوهشی
- مجله: Caspian Journal of Environmental Sciences
- نوع مقاله: Journal Article
- کلمات کلیدی: cold shocks,heat shocks,Grass carp,triploidy
- چکیده:
- چکیده انگلیسی: Triploidy in grass carp, Ctenopharyngodon idella Valenciennes, 1844, was induced on fertilized eggs to compare cold and heat shocks. Two simplified methods explained for verification of triploidy in grass carp. The cold shock (7 ?C) was given in three treatments for 30 min starting 2.0, 2.5 and 4.0 min after fertilization. In cold shock, the start point (2.0 min after fertilization) showed the highest rate of triploidy (60.9%). Heat shocks were given at 38 ?C, 40 ?C and 42 ?C, at 4.0 min after fertilization and lasted for 1.0 min. Produced larvae using heat shock 38 ?C showed 10.8% triploidy, but no signs of triploidy were seen in other heat shock treatments. Verification of triploidy in grass carp was carried out using karyotyping and measurment of erythrocytes surface area and volume in fingerlings. Ratio of erythrocytes dimention and the size of their nuclei in triploids to diploids was 2.35 and 1.80, respectively. Comparison of results obtained from the application of cold and heat shocks indicated that cold shocks are more effective than heat shocks in the induction of triploidy in grass carp.
- انتشار مقاله: 11-10-1348
- نویسندگان: M. Pourkazemi,M. Hassanzadeh Saber
- مشاهده